Characterization of Fibres and Fibre Collectives with Common Laser Diffractometers

Berthold, Christoph; Klein, Robert H.; Luhmann, J. R.; Nickel, Klaus G.

doi:10.1002/1521-4117(200010)17:3<113::aid-ppsc113>3.0.co;2-z

Cited by 15 publications

(5 citation statements)

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“…Differences in particle size can also arise as a consequence of the use of different laser diffractometers and techniques. These include the specific numerical algorithm used to analyse diffraction data (Etzler and Deanne, 1997), the potential for dispersion in a liquid to alter the particle shape, volume, and dissolution characteristics of the sample, and also the orientation of particles in the sample cell (Berthold et al, 2000). …”

Section: Discussionmentioning

confidence: 99%

Rapid characterisation of the inherent dispersibility of respirable powders using dry dispersion laser diffraction

Jaffari

Forbes

Collins

et al. 2013

International Journal of Pharmaceutics

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Section: Discussionmentioning

confidence: 99%

Rapid characterisation of the inherent dispersibility of respirable powders using dry dispersion laser diffraction

Jaffari

Forbes

Collins

et al. 2013

International Journal of Pharmaceutics

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“…Mixtools software package in R programming language was used to fit XRD and particle size distribution data. The size distribution of elongated particles, 1D and 2D structures, analyzed by LD methods appeared as a mixture of Gaussian distributions [28,29], i.e. a multimodal distribution.…”

Section: Methodsmentioning

confidence: 99%

Hydrothermally processed 1D hydroxyapatite: Mechanism of formation and biocompatibility studies

Stojanović

Ignjatović

et al. 2016

Materials Science and Engineering: C

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Recent developments in bone tissue engineering have led to an increased interest in one-dimensional (1D) hydroxyapatite (HA) nano- and micro-structures such as wires, ribbons and tubes. They have been proposed for use as cell substrates, reinforcing phases in composites and carriers for biologically active substances. Here we demonstrate the synthesis of 1D HA structures using an optimized, urea-assisted, high-yield hydrothermal batch process. The one-pot process, yielding HA structures composed of bundles of ribbons and wires, was typified by the simultaneous occurrence of a multitude of intermediate reactions, failing to meet the uniformity criteria over particle morphology and size. To overcome these issues, the preparation procedure was divided to two stages: dicalcium phosphate platelets synthesized in the first step were used as a precursor for the synthesis of 1D HA in the second stage. Despite the elongated particle morphologies, both the precursor and the final product exhibited excellent biocompatibility and caused no reduction of viability when tested against osteoblastic MC3T3-E1 cells in 2D culture up to the concentration of 2.6 mg/cm2. X-ray powder diffraction combined with a range of electron microscopies and laser diffraction analyses was used to elucidate the formation mechanism and the microstructure of the final particles. The two-step synthesis involved a more direct transformation of DCP to 1D HA with the average diameter of 37 nm and the aspect ratio exceeding 100:1. The comparison of crystalline domain sizes along different crystallographic directions showed no signs of significant anisotropy, while indicating that individual nanowires are ordered in bundles in the b crystallographic direction of the P63/m space group of HA. Intermediate processes, e.g., dehydration of dicalcium phosphate, are critical for the formation of 1D HA alongside other key aspects of this phase transformation, it must be investigated in more detail in the continuous design of smart HA micro- and nano-structures with advanced therapeutic potentials.

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“…It could also be shown that, while sedimentation methods yield equivalent Stokes diameters for disc-shaped particles, laser diffraction reveals, in reasonable approximation, the real disc diameters in a mass% or vol% graph [11], independent of the orientation of the discs. This applies to the assumption that L D S either the particles are statistically oriented in the measurement volume or the detector obtains the whole or a representative scattering information from the particle collective [7,[10][11][12]. Based upon these considerations, the comparison of laser diffraction and sedimentation data via Eq.…”

Section: Withmentioning

confidence: 99%

“…Particle size and shape are crucial evaluation criteria for powdered and natural raw materials because they strongly affect the final products [1,2]. Normally size distribution and shape are investigated separately [2].…”

Section: Introductionmentioning

confidence: 99%

“…Sedimentation methods show distinctly higher values for fine particles, especially for clayey materials [6] whereas laser diffraction gives a higher proportion of coarser grains. These differences are due to the anisometric habiti of the particles [1,7]. A lot of efforts have been made to convert laser data into sedimentation data or to extract information about particle shapes from these measurements [2, 6 -10].…”

Section: Introductionmentioning

confidence: 99%

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Particle Size and Shape Characterization of Kaolins-Comparison of Settling Methods and Laser Diffraction

Lehmann¹,

Berthold²,

Pabst

et al. 2004

KEM

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It is well known that grain size distributions of clayey raw materials determined by sedimentation methods differ significantly from grain size distributions measured with laser diffractometers due to the anisometric shapes of the particles. Investigation on commercial Czech kaolins by XRD and SEM revealed that the differences of the grain size distributions can be attributed to different mineral contents of the fractions and varying habiti of the kaolinite. It is shown that a numerical analysis of the development of shape with grain size ("SSD-curve") can translate between the grain size determination methods. The shape of those SSD-curves is regular and offers the possibility to evaluate the phase content of the kaolins.

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Characterization of Fibres and Fibre Collectives with Common Laser Diffractometers

Cited by 15 publications

References 1 publication

Rapid characterisation of the inherent dispersibility of respirable powders using dry dispersion laser diffraction

Rapid characterisation of the inherent dispersibility of respirable powders using dry dispersion laser diffraction

Hydrothermally processed 1D hydroxyapatite: Mechanism of formation and biocompatibility studies

Particle Size and Shape Characterization of Kaolins-Comparison of Settling Methods and Laser Diffraction

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